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2004 Grand Cherokee engine periodically revs when in overdrive

Tiny
JBMELITSKI
  • MEMBER
  • 2004 JEEP CHEROKEE
  • 106,000 MILES
While riding at 65 - 70 mph the tach periodically jumps from 2100 to 2500 rpms and back. Transmission fluid is clean and full.
Sunday, November 6th, 2011 AT 10:45 PM

3 Replies

Tiny
BILLYMAC
  • MECHANIC
  • 2,204 POSTS
Hi this undoubtedly a trans slip possibly caused by the trans or a input output sensor. Or computer. You will need to have trans scanned for fault codes this will tell you exactly what is happening. Good luck
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Sunday, November 6th, 2011 AT 10:51 PM
Tiny
MIKEY113
  • MEMBER
  • 1 POST
I have seen a erratic throttle position sensor cause the torque converter clutch to disengage and engage causing a 200-300 rpm surge. I would look into that first - it usually only fluctuates a couple of 1/10ths of a volt while the throttle is steady which wouldn't trigger a trouble code. I've seen this on a few Grand Cherokees with the 4.0LI6 and the old 42re trans.
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Tuesday, November 8th, 2011 AT 3:55 AM
Tiny
BILLYMAC
  • MECHANIC
  • 2,204 POSTS
Mikey is right. I am sorry I mis read your post torque lock up is most likely the prob.
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Tuesday, November 8th, 2011 AT 5:41 PM

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